JP2009167604A - Hollow-portion form embedment material for hollow slab - Google Patents

Hollow-portion form embedment material for hollow slab Download PDF

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JP2009167604A
JP2009167604A JP2008003942A JP2008003942A JP2009167604A JP 2009167604 A JP2009167604 A JP 2009167604A JP 2008003942 A JP2008003942 A JP 2008003942A JP 2008003942 A JP2008003942 A JP 2008003942A JP 2009167604 A JP2009167604 A JP 2009167604A
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hollow
slab
hole
hollow part
connecting screw
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Chieko Iwanaga
千恵子 岩永
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TRADE JUN KK
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TRADE JUN KK
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • E04B5/326—Floor structures wholly cast in situ with or without form units or reinforcements with hollow filling elements
    • E04B5/328—Floor structures wholly cast in situ with or without form units or reinforcements with hollow filling elements the filling elements being spherical

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  • Architecture (AREA)
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a hollow-portion form embedment material for a hollow slab, which has a structure enabling the easily attachment/detachment of a connecting fitting and an embedment body. <P>SOLUTION: A bearing nut (13) for being screwed to a connecting screw (11c) is unrotatably pressed into an embedment body element (12a). Thus, the bearing nut (13) is separated from the connecting screw (11c) by rotating the embedment body (12), and the embedment body (12) can be easily separated from the hollow-portion form embedment material (10) for the hollow slab. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

本発明は、建築物の鉄筋コンクリートスラブ内に軽量材からなる埋込体（ボイド）を埋設して軽量のコンクリートスラブを形成する技術に関する。   The present invention relates to a technique for forming a lightweight concrete slab by embedding an embedded body (void) made of a lightweight material in a reinforced concrete slab of a building.

軽量材からなる埋込体をコンクリート内に埋設したコンクリートボイドスラブ工法が知られている。
すなわち、ボイドと称される軽量材から成る埋込体を型枠板の上面に適宜配置し、その後、コンクリートを打設するものである。
これにより、コンクリート内に中空部が形成され、コンクリートスラブの軽量化を図り、また、遮音性等を向上させることができる。 A concrete void slab method in which an embedded body made of a lightweight material is embedded in concrete is known.
That is, an embedded body made of a lightweight material called a void is appropriately disposed on the upper surface of the formwork plate, and then concrete is placed.
Thereby, a hollow part is formed in concrete, weight reduction of a concrete slab can be achieved, and sound insulation etc. can be improved.

ところで、従来のコンクリートボイドスラブ工法にあっては、コンクリートの打設時に埋込体が浮き上がったり、移動したりしてしまうという問題があった。
すなわち、埋込体は軽量材、例えば、発泡スチロールなどが使われるため、コンクリートの打設時に大きな浮力が掛かってしまい、埋込体をコンクリートスラブの所定の位置に置いたとしても移動してしまい、設計通りの位置に埋込体を埋設することは必ずしも容易なことではない。 By the way, in the conventional concrete void slab method, there existed a problem that an embedding body floated or moved at the time of concrete placement.
That is, since the embedded body is made of a lightweight material, for example, polystyrene foam, a large buoyancy is applied when placing concrete, and the embedded body moves even if it is placed at a predetermined position of the concrete slab. It is not always easy to embed an embedded body at a designed position.

このような埋込体の浮き上がり、移動を防止するものとして、縦横に配筋された上端筋のうち、一方の上端筋に対してほぼ平行に配置される２本の支持筋と、支持筋に接合され埋込体を固定する埋込体固定部による埋込体固定金具を、長さを通常の人間の両手を広げた長さに対応させて、用いたものがある。
以下に示す特許文献は、このような埋込体固定金具を上端筋の上に配置している。そして、埋込体固定金具は上端筋に対して結束することにより固定され、
埋込体固定金具が移動することもなく、埋込体を精度良く位置決めすることができる。また、埋込体固定金具の固定片を嵌入するだけで埋込体を固定することができるため、固定手段の構造が簡単で、その取付（固定）作業性をきわめて容易にすることができる。これにより、簡単な構造で埋込体をコンクリートスラブ内において設計上の所定の位置に埋設することができ、均質なコンクリートスラブを提供することができる。
このような技術に関してはたとえば特許文献１の広報に開示されている。
特許公開２００５−１６３３４０ In order to prevent the floating and moving of such an implant, two support muscles arranged substantially parallel to one of the upper muscles arranged vertically and horizontally, and There is a type that uses an embedded body fixing bracket made of an embedded body fixing part that joins and fixes an embedded body, with the length corresponding to the length of a normal human hand.
The patent document shown below arrange | positions such an embedded body fixing metal fitting on an upper end line. And the implant fixing bracket is fixed by binding to the upper end muscle,
The embedded body can be positioned with high accuracy without moving the embedded body fixing bracket. Further, since the embedded body can be fixed simply by inserting the fixing piece of the embedded body fixing metal fitting, the structure of the fixing means is simple, and its mounting (fixing) workability can be made extremely easy. Thereby, the embedded body can be embedded at a predetermined design position in the concrete slab with a simple structure, and a homogeneous concrete slab can be provided.
Such a technique is disclosed in, for example, the public relations of Patent Document 1.
Patent Publication 2005-163340

しかし、上記広報に記載されたボイドスラブ工法にあっては、埋込体固定金物と埋込体の分離作業と連結作業が頻繁に発生し、分離作業にあたり、埋込体が損傷することがあった。損傷した埋込体を埋込体固定金物に連結した場合、固定状態が不安定となり、また埋込体の破片が周辺へ飛散し、回収及び清掃が困難となる。   However, in the void slab method described in the above-mentioned public relations, the separation work and the connection work of the embedded body and the embedded body frequently occur, and the embedded body may be damaged during the separation work. . When a damaged implant is connected to an implant fixing hardware, the fixing state becomes unstable, and fragments of the implant scatter to the periphery, making recovery and cleaning difficult.

本発明は、上述した背景技術に鑑み成されたものであって、その目的は連結用金具と埋込体を容易に着脱できる構造を有した中空スラブ用中空部型枠埋込材を提供することである。
課題を解決するための手段 The present invention has been made in view of the above-described background art, and an object thereof is to provide a hollow part formwork embedding material for a hollow slab having a structure in which a connection fitting and an embedding body can be easily attached and detached. That is.
Means for solving the problem

請求項１に記載した発明は、コンクリートスラブ内に四方に並列される小空間の中空部を形成する中空スラブ工法に用いられる中空部型枠埋込材（１０）であって、
2本の支持鉄筋（１１ａ）に一定間隔に設けられたT型鉄筋（１１ｂ）の下部に連結用ネジ（１１ｃ）が形成されている連結金具（１１）と
前記連結金具（１１）と螺合した埋込体（１２）、から成る事を特徴とする中空スラブ用中空部型枠埋込材（１０）である。 The invention described in claim 1 is a hollow part formwork embedding material (10) used in a hollow slab method for forming a hollow part of a small space arranged in parallel in four directions in a concrete slab,
A connecting metal fitting (11) in which a connecting screw (11c) is formed at the lower part of a T-type reinforcing bar (11b) provided at regular intervals on two support reinforcing bars (11a), and the connecting metal fitting (11). It is the hollow part form | mold embedding material (10) for hollow slabs characterized by consisting of the embedded body (12).

請求項２に記載した発明は、前記埋込体（１２）が、型枠外殻を２つ割りにした如き形状をし、前記連結用ねじ（１１ｃ）が貫通する貫通孔（１２ｂ）が形成された埋込体要素（１２ａ１、１２ａ２）と
円筒部（１３ａ）に前記連結用ネジ（１１ｃ）が螺合するめねじ孔（１３ｃ）と、前記貫通孔（１２ｂ）内で該円筒部（１３ａ）が回転することを防止する回転防止リブ（１３ｄ）と、該円筒部（１３ａ）が該貫通孔（１２ｂ）から引き抜かれることを防止したつば（１３ｅ）が設けられ、該貫通孔（１２ｂ）に前記埋込体要素（１２ａ１、１２ａ２）の内側から回転不能に押入れられることで該埋込体要素（１２ａ１、１２ａ２）と連結し、該連結用ねじ（１１ｃ）と螺合する支圧ナット（１３）と、
前記支圧ナット（１３）を押入れた前記埋込体要素（１２ａ１、１２ａ２）を開口周縁（１２ｃ）を合わせて組み立てることにより形成される事、を特徴とする請求項１に記載した中空スラブ用中空部型枠埋込材（１０）である According to a second aspect of the present invention, the embedded body (12) has a shape such that the outer shell of the mold is divided into two, and a through hole (12b) through which the connecting screw (11c) passes is formed. The embedded element (12a1, 12a2) and the cylindrical part (13a), the female screw hole (13c) into which the connecting screw (11c) is screwed, and the cylindrical part (13a) in the through hole (12b). An anti-rotation rib (13d) for preventing rotation and a collar (13e) for preventing the cylindrical portion (13a) from being pulled out from the through hole (12b) are provided. A support nut (13) which is connected to the implant element (12a1, 12a2) by being pushed non-rotatably from the inside of the implant element (12a1, 12a2) and is screwed to the connecting screw (11c). When,
2. The hollow slab according to claim 1, wherein the embedded element (12 a 1, 12 a 2) into which the bearing nut (13) is pressed is assembled by aligning the opening peripheral edge (12 c). 3. It is a hollow part formwork embedding material (10)

請求項１に記載した発明によれば、簡単な構造で埋込体（６）をコンクリートスラブ（１）内において設計上の所定の位置に埋設することができ、均質なコンクリートスラブ（１）を提供することができる。   According to the first aspect of the present invention, the embedded body (6) can be embedded in a predetermined design position in the concrete slab (1) with a simple structure. Can be provided.

請求項２に記載した発明によれば、上記埋込体要素（１２ａ）に連結金具下部（１１ｃ）と螺合する支圧ナット（１３）が回転不能に押入れてあるため、埋込体（１２）を回転することで支圧ナット（１３）が連結用ねじ（１１ｃ）と分離し、中空スラブ用中空部型枠埋込体（１０）から埋込体（１２）が容易に分離できる。   According to the invention described in claim 2, since the supporting nut (13) screwed into the connecting metal lower part (11c) is non-rotatably pressed into the embedded element (12a), the embedded body (12 ) Is separated from the connection screw (11c), and the embedded body (12) can be easily separated from the hollow formwork embedded body (10) for the hollow slab.

図に示した通り本発明は中空スラブ工法専用の中空スラブ用中空部型枠埋込材（１０）であり、中空スラブ工法のコンクリート打設時の前作業に応用するものである。本発明の特徴は埋込体（１２）が確実に固定された中空スラブ用中空部型枠埋込材を提供することと、中空スラブ用中空部型枠埋込材（１０）から埋込体（１２）を容易に分離できる簡単な構造とすることである。   As shown in the figure, the present invention is a hollow slab hollow frame form embedment material (10) dedicated to the hollow slab method, and is applied to the pre-operation when placing concrete in the hollow slab method. A feature of the present invention is to provide a hollow part formwork embedding material for a hollow slab in which an embedding body (12) is securely fixed, and from the hollow part formwork embedding material (10) for a hollow slab to an embedding body. (12) is to have a simple structure that can be easily separated.

以下、本発明の好ましい実施の形態ついて説明する。
本発明コンクリートスラブ内に四方に並列される小空間の中空部を形成する中空スラブ工法に用いられる中空スラブ用中空部型枠埋込材（１０）であって、
2本の支持鉄筋（１１ａ）に一定間隔に設けられたT型鉄筋（１１ｂ）の下部に連結用ネジ（１１ｃ）が形成されている連結金具（１１）と
前記連結金具（１１）と螺合した埋込体（１２）、から成る事を特徴とする中空スラブ用中空部型枠埋込材（１０）である。 Hereinafter, preferred embodiments of the present invention will be described.
A hollow part mold embedding material (10) for a hollow slab used in a hollow slab method for forming a hollow part of a small space arranged in parallel in all directions in the concrete slab of the present invention,
A connecting metal fitting (11) in which a connecting screw (11c) is formed at the lower part of a T-type reinforcing bar (11b) provided at regular intervals on two support reinforcing bars (11a), and the connecting metal fitting (11). It is the hollow part form | mold embedding material (10) for hollow slabs characterized by consisting of the embedded body (12).

また、本発明コンクリートボイドスラブ工法は、縦横に配筋された上端筋（４Ｘ、４Ｙ）と下端筋（３Ｘ、３Ｙ）との間に軽量材からなる埋込体（１２）位置させ、コンクリートＣを打設することにより上記埋込体（１２）、…をコンクリートスラブ１内に埋設するコンクリートボイドスラブ工法であって、縦横に配筋された上端筋（４Ｘ、４Ｙ）のうち、一方の上端筋（４ｘ）に対してほぼ平行に配置される支持鉄筋（１１ａ）と、上記支持鉄筋（１１ａ）に接合され上記埋込体（１２）に螺合する連結用ねじ（１１ｃ）を設けたＴ型鉄筋（１１ｂ）を有した連結金具（１１）を用い、該連結金具（１１）に埋込体（１１）を固定して中空部型枠埋込材（１０）した後、各埋込体６を縦横に配筋された上端筋（４Ｘ、４Ｙ）と下端筋（３Ｘ、３Ｙ）との間に上方から挿入して位置させ、中空部型枠埋込材（１０）を上端筋（４Ｙ）に固定した後、コンクリートＣを打設するようにしたものである。 Moreover, the concrete void slab method of the present invention positions the embedded body (12) made of a lightweight material between the upper end bars (4X, 4Y) and the lower end bars (3X, 3Y) arranged vertically and horizontally, and the concrete C It is a concrete void slab construction method in which the embedded body (12), ... is embedded in the concrete slab 1 by placing, and one of the upper end bars (4X, 4Y) arranged vertically and horizontally 4x) T-type reinforcing bars provided with supporting reinforcing bars (11a) and connecting screws (11c) that are joined to the supporting reinforcing bars (11a) and screwed into the embedded body (12). After using the connecting metal fitting (11) having (11b) and fixing the embedded body (11) to the connecting metal fitting (11) to form the hollow part formwork embedding material (10), Top and bottom bars (4X, 4Y) and bottom bars (3X) Is positioned by inserting from above between 3Y), after fixing the hollow portion formwork filler material (10) at the upper end muscle (4Y), in which the concrete C was such that pouring.

例えば、コンクリートスラブ１の厚さが２５０ｍｍの場合、上端筋（４Ｘ、４Ｙ）と下端筋（３Ｘ、３Ｙ）はともにφ１３ｍｍの鉄筋が使用され、配筋ピッチ２５０ｍｍ（±１ｍｍ）で配筋されている。なお、「±１ｍｍ」は許容誤差を示す。また、上端筋（４Ｘ、４Ｙ）より上側の部分のコンクリートＣの厚さ（かぶり）及び下端筋（３Ｘ、３Ｙ）より下側の部分のコンクリートＣの厚さ（かぶり）をそれぞれ３０ｍｍとされる。 For example, when the thickness of the concrete slab 1 is 250 mm, the upper reinforcing bars (4X, 4Y) and the lower reinforcing bars (3X, 3Y) are both 13 mm reinforcing bars and are arranged at a reinforcing bar pitch of 250 mm (± 1 mm). Yes. “± 1 mm” indicates an allowable error. Further, the thickness (cover) of the concrete C above the upper end bars (4X, 4Y) and the thickness (cover) of the concrete C below the lower end bars (3X, 3Y) are each set to 30 mm. .

縦横に配筋された上端筋（４Ｘ、４Ｙ）は、例えば一定の配筋ピッチ２５０ｍｍで配筋された上端筋（４Ｘ）と、これと直交する方向に伸びるように配筋された上端筋（４Ｙ）とし、一方の上端筋（３Ｘ）は他方の上端筋３ｙの上側に載置されている。
また、縦横に配筋された下端筋（３Ｘ、３Ｙ）は、例えば一定の配筋ピッチ２５０ｍｍで配筋された下端筋（３Ｘ）と、これと直交する方向に伸びるように配筋された下端筋（３Ｙ）とし、一方の上端筋（３Ｘ）は他方の上端筋（３Ｙ）の上側に載置されている。そして、上端筋（４Ｙ）と下端筋（３Ｙ）との間の間隔が１３８ｍｍとされている。 The upper reinforcement (4X, 4Y) arranged vertically and horizontally is, for example, the upper reinforcement (4X) arranged at a constant arrangement pitch of 250 mm, and the upper reinforcement (4X) arranged to extend in a direction orthogonal thereto. 4Y), and one upper end line (3X) is placed on the upper side of the other upper end line 3y.
The bottom bars (3X, 3Y) arranged vertically and horizontally are, for example, the bottom bars (3X) arranged at a constant bar arrangement pitch of 250 mm and the lower ends arranged so as to extend in a direction perpendicular thereto. One upper end line (3X) is placed on the upper side of the other upper end line (3Y). And the space | interval between an upper end reinforcement (4Y) and a lower end reinforcement (3Y) is set to 138 mm.

この他、上記実施例において、上述した各部の寸法は本発明の一実施例における数値例であり、本発明はこれに限定されるものでないことは勿論である。 In addition, in the said Example, the dimension of each part mentioned above is a numerical example in one Example of this invention, Of course, this invention is not limited to this.

連結金具の立体図である。It is a three-dimensional view of a connecting metal fitting. 中空スラブ用中空部型枠埋込材の立体図である。It is a three-dimensional view of the hollow part mold embedding material for hollow slabs. 中空スラブ用中空部型枠埋込材の断面図及び側面図である。It is sectional drawing and the side view of the hollow part mold-embedding material for hollow slabs. Ｔ型鉄筋の拡大図である。It is an enlarged view of a T-type reinforcing bar. 支圧ナットの立体図である。It is a three-dimensional view of a bearing nut. 埋込体要素の立体図である。It is a three-dimensional view of an embedded element. 本発明である中空スラブ用中空部型枠埋込材を用いたコンクリートスラブ施工法の作業手順を示したものである。The work procedure of the concrete slab construction method using the hollow part formwork embedding material for hollow slabs which is this invention is shown.

符号の説明Explanation of symbols

１ コンクリートスラブ
２ 型枠
３ 上端筋
３ｘ 一方の下端筋
３ｙ 他方の下端筋
４ 下端筋
４ｘ 一方の上端筋
４ｙ 一方の上端筋
１０中空スラブ用中空部型枠埋込材
１１連結用金具
１１ａ支持鉄筋
１１ｂＴ型鉄筋
１１ｃ連結用ねじ
１２埋込体
１２ａ埋込体要素
１２ｂ貫通孔
１２ｃ開口周縁
１３支圧ナット
１３ａ円筒部
１３ｂ開口周縁
１３ｄ回転防止リブ
１３ｅつば
Ｃ コンクリート DESCRIPTION OF SYMBOLS 1 Concrete slab 2 Formwork 3 Upper end reinforcement 3x One lower end reinforcement 3y The other lower end reinforcement 4 Lower end reinforcement 4x One upper end reinforcement 4y One upper end reinforcement 10 11bT type rebar 11c connecting screw 12 embedded body 12a embedded body element 12b through hole 12c opening peripheral edge 13 bearing nut 13a cylindrical part 13b opening peripheral edge 13d rotation preventing rib 13e collar C concrete

Claims (2)

コンクリートスラブ内に四方に並列される小空間の中空部を形成する中空スラブ工法に用いられる中空部型枠埋込材（１０）であって、
2本の支持鉄筋（１１ａ）に一定間隔に設けられたT型鉄筋（１１ｂ）の下部に連結用ネジ（１１ｃ）が形成されている連結金具（１１）と
前記連結金具（１１）と螺合した埋込体（１２）、から成る事を特徴とする中空スラブ用中空部型枠埋込材（１０） A hollow part frame embedding material (10) used in a hollow slab method for forming a hollow part of a small space arranged in parallel in a concrete slab,
A connecting metal fitting (11) in which a connecting screw (11c) is formed at the lower part of a T-type reinforcing bar (11b) provided at regular intervals on two support reinforcing bars (11a), and the connecting metal fitting (11). Hollow part formwork embedding material (10) for hollow slabs, characterized by comprising: 前記埋込体（１２）が、型枠外殻を２つ割りにした如き形状をし、前記連結用ねじ（１１ｃ）が貫通する貫通孔（１２ｂ）が形成された埋込体要素（１２ａ１、１２ａ２）と
円筒部（１３ａ）に前記連結用ネジ（１１ｃ）が螺合するめねじ孔（１３ｃ）と、前記貫通孔（１２ｂ）内で該円筒部（１３ａ）が回転することを防止する回転防止リブ（１３ｄ）と、該円筒部（１３ａ）が該貫通孔（１２ｂ）から引き抜かれることを防止したつば（１３ｅ）が設けられ、該貫通孔（１２ｂ）に前記埋込体要素（１２ａ１、１２ａ２）の内側から回転不能に押入れられることで該埋込体要素（１２ａ１、１２ａ２）と連結し、該連結用ねじ（１１ｃ）と螺合する支圧ナット（１３）と、
前記支圧ナット（１３）を押入れた前記埋込体要素（１２ａ１、１２ａ２）を開口周縁（１２ｃ）を合わせて組み立てることにより形成される事、を特徴とする請求項１に記載した中空スラブ用中空部型枠埋込材（１０） The embedded element (12a1, 12a2) has a shape such that the outer shell (12) is divided into two outer shells, and has a through hole (12b) through which the connecting screw (11c) passes. ) And the cylindrical portion (13a), the female screw hole (13c) into which the connecting screw (11c) is screwed, and the anti-rotation rib for preventing the cylindrical portion (13a) from rotating in the through hole (12b). (13d) and a collar (13e) that prevents the cylindrical portion (13a) from being pulled out of the through hole (12b) are provided, and the embedded element (12a1, 12a2) is provided in the through hole (12b). A support nut (13) that is connected to the implant element (12a1, 12a2) by being pushed non-rotatably from the inside, and screwed with the connecting screw (11c);
2. The hollow slab according to claim 1, wherein the embedded element (12 a 1, 12 a 2) into which the bearing nut (13) is pressed is assembled by aligning the opening peripheral edge (12 c). 3. Hollow part formwork embedding material (10)
JP2008003942A 2008-01-11 2008-01-11 Hollow-portion form embedment material for hollow slab Pending JP2009167604A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102251673A (en) * 2010-06-13 2011-11-23 吴方伯 Construction method for reinforced concrete hollow floor
US20150001764A1 (en) * 2012-02-14 2015-01-01 Ajou University Industry-Academic Cooperation Foundation Mold for construction structure and method for manufacturing construction structure using same
DE102015009485A1 (en) * 2015-07-21 2017-01-26 Hochschule Bochum Arrangements of displacement bodies for insertion into reinforced concrete components, displacement body and serving to secure the displacement body holding and spacer elements and reinforced concrete component
KR20190101136A (en) * 2018-02-22 2019-08-30 가톨릭관동대학교산학협력단 Cube-shaped hollow lightweight material for reducing concrete usage

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102251673A (en) * 2010-06-13 2011-11-23 吴方伯 Construction method for reinforced concrete hollow floor
CN102251673B (en) * 2010-06-13 2013-08-28 吴方伯 Construction method for reinforced concrete hollow floor
US20150001764A1 (en) * 2012-02-14 2015-01-01 Ajou University Industry-Academic Cooperation Foundation Mold for construction structure and method for manufacturing construction structure using same
DE102015009485A1 (en) * 2015-07-21 2017-01-26 Hochschule Bochum Arrangements of displacement bodies for insertion into reinforced concrete components, displacement body and serving to secure the displacement body holding and spacer elements and reinforced concrete component
DE102015009485B4 (en) * 2015-07-21 2019-11-21 Andrej Albert Arrangements of displacement bodies for insertion into reinforced concrete components, displacement body and serving to secure the displacement body holding and spacer elements and reinforced concrete component
KR20190101136A (en) * 2018-02-22 2019-08-30 가톨릭관동대학교산학협력단 Cube-shaped hollow lightweight material for reducing concrete usage
KR102068116B1 (en) 2018-02-22 2020-01-20 가톨릭관동대학교산학협력단 Cube-shaped hollow lightweight material for reducing concrete usage

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